docs: def synthetic_source(self, value):
          """The synthetic_source property.
          
          Args:
              value (string). the property value.
          """
          if value == self._defaults['ai.operation.syntheticSource'] and 'ai.operation.syntheticSource' in self._values:
              del self._values['ai.operation.syntheticSource']
          else:
              self._values['ai.operation.syntheticSource'] = value